Question

the weight of magnesium which has the same number of atoms are present in 8 grams of Methane is

Answer 1

the methane is 16 gram

Answer 2

Answer:

The weight of magnesium = 60 gm

Explanation:

Methane: molar mass of methane = 16 gm. Given mass of methane = 8 gm.

                Moles = $\frac{given mass}{molar mass}$ = $\frac{8}{16}$ = 0.5

                Molecules = moles × 6.023 × $10 ^{23}$ = 0.5 × 6.023 × $10 ^{23}$

 Each methane molecule contains 5 atoms

So number of methane atoms = 0.5 × 6.023 × $10 ^{23}$ × 5 = 15.05 × $10 ^{23}$

Magnesium:  Molecular mass of magnesium = 24 gm.

 24 gm magnesium contains 6.023 × $10 ^{23}$ atoms

  6.023 × $10 ^{23}$ atoms are in 24 gm magnesium

 15.05 × $10 ^{23}$ atoms are in  $\frac{15.05*10^{23} * 24}{6.023*10^{23}}$ = 59.97 ≈ 60 gm of magnesium

∴The weight of magnesium = 60 gm